Injector removal and Idle adjust on 300E

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Guenter Scholz - 19 Apr 2005 17:01 GMT

Sorry for the queston. Someone within the last couple of weeks noted on the
newsgroup that there was a idle adjust screw that (likely) will give a small
measure of control over the rpm. I lost that post, anyone know where this
screw is?

Also, Mr. Lambach noted wrt the re/re of injectors that a detailed account of
how to do this is posted at the 'Archives" how, exactly, do I access these
Archives since I need to replace my injectors as well it appears.

- thanks

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T.G. Lambach - 19 Apr 2005 23:41 GMT

There are no "archives" as such, just old posts to the NG, so don't look
for something that doesn't exist. My NG post was to describe the cure
for a delayed hot start problem.

Fuel injectors:

They are fed by a fuel rail whose connection to each is sealed by a
rubber "O" ring.

The injectors' connection to the engine is sealed by an "O" ring.

The injectors can be professionally cleaned and flow tested for not much
money. Do a Google search: "fuel injector service" for a shop to do
this. Injectors that are internally rusted or corroded need to be replaced.

The trick to removing the injectors is to depressurize the 45 psi fuel
rail so fuel doesn't spray all over. I read that some Volvo owners run
the engine and pull the fuel pump relay to cut off the fuel supply and
so let the engine reduce the pressure.

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Guenter Scholz - 20 Apr 2005 12:34 GMT

>Fuel injectors:
>
>They are fed by a fuel rail whose connection to each is sealed by a
>rubber "O" ring.
>
>The injectors' connection to the engine is sealed by an "O" ring.

many thanks for the information. Never having done this before, I
assume one needs to remove the airfilter housing to get access to the
injectors which will remove similar to a spark plug once the fuel line to
them is disconnected.... am I even close?

cheers, guenter

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T.G. Lambach - 20 Apr 2005 21:34 GMT

I don't know the air ducting layout of a 300E (I own a E320) so that's
up to you to decide.

The injectors are secured by clips and plug in, not screw in. Suggest
you do a Google search on "fuel injector replacement" to see some
pictures of how others have changed their car's injectors. If you want
to have your injectors cleaned be sure not to damage them; smear a bit
of oil onto the "O" rings prior to installing each replacement injector.

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r parris - 23 Apr 2005 04:27 GMT

Mercedes Archives try www.mercedes.cx/

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